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Preparation method of ferroferric oxide nanoparticles

A technology of ferric tetroxide and nanoparticles, which is applied in the field of nanomaterials, can solve the problems of less compliance with green chemistry rules, toxic and high reaction temperature, high cost, etc., and achieves simple and easy operation of the synthesis device, narrow size distribution, and short time consumption. Effect

Active Publication Date: 2021-12-31
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the wet chemical methods for synthesizing ferric oxide nanoparticles are mainly co-precipitation method and thermal decomposition method. The ferric oxide nanoparticle method prepared by co-precipitation method needs to mix ferrous salt and ferric salt mixed solution with hydroxide Sodium or ammonia precipitation reaction, the preparation of simple product particles has a wide size distribution, while thermal decomposition can prepare high-quality nanoparticles, but the production rarely follows the rules of green chemistry, using inert gas atmospheres, organic solvents, expensive and toxic reagents, and long-term production. Time high reaction temperature; and the synthesis is mainly based on laboratory, small-scale, batch synthesis

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  • Preparation method of ferroferric oxide nanoparticles
  • Preparation method of ferroferric oxide nanoparticles
  • Preparation method of ferroferric oxide nanoparticles

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Embodiment 1

[0028] A method for continuously producing ferric oxide nanoparticles by oxidation precipitation, specifically comprising the following steps:

[0029] The ammonia water container that 10ml is housed is fixed on the continuous flow reactor side wall, 0.3976gFe 2+ Salt was added to 50ml deionized water, by setting the Fe 2+ The concentration of the aqueous solution is 1mM, the flow rate of solution injection is 1ml / s, then the disc rotation speed of the continuous flow reactor is adjusted to 1000rpm, and the reaction temperature is 20°C, and the obtained product is magnetically separated by a magnet to obtain ferric oxide nanoparticles. Among them, the above Fe 2+ For ferrous chloride.

Embodiment 2

[0031] The ammonia water container that 10ml is housed is fixed on the continuous flow reactor side wall, and 1.988gFe 2+ Salt was added to 50ml deionized water, by setting the Fe 2+ The concentration of the aqueous solution is 100mM, the flow rate of the solution injection is 0.3ml / s, then the disc rotation speed of the continuous flow reactor is adjusted to 2000rpm, and the reaction temperature is 50°C, and the obtained product is magnetically separated by a magnet to obtain ferric oxide nanoparticles. Among them, the above Fe 2+ For ferrous chloride.

Embodiment 3

[0033] The ammonia water container that 10ml is housed is fixed on the continuous flow reactor side wall, 0.7952gFe 2+ Salt was added to 50ml deionized water, by setting the Fe 2+ The concentration of the aqueous solution is 200mM, the flow rate of solution injection is 4ml / s, then the disc rotation speed of the continuous flow reactor is adjusted to be 1250rpm, and the reaction temperature is 80°C, and the resulting product is magnetically separated with a magnet to obtain ferric oxide nanoparticles. Among them, the above Fe 2+ For ferrous chloride.

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Abstract

The invention relates to the technical field of nano materials, and in particular, relates to a preparation method of ferroferric oxide nanoparticles, wherein the preparation method comprises the steps: injecting Fe<2+> aqueous solutions with different concentrations into a rotating disc to form a layer of film on the surface of the rotating disc by adopting a continuous flow reactor additionally provided with an ammonia water container, reacting with volatile ammonia gas and dissolved oxygen in the film, collecting a product at a liquid outlet only in several seconds, and magnetically separating the obtained reaction liquid by a neodymium iron boron strong magnet to obtain the ferroferric oxide nanoparticles. Compared with the prior art, auxiliary agents such as organic solvents and surfactants are not needed, and reaction conditions such as heating, pressurizing and inert gas protection are not needed; and an air oxidation method is adopted, the reaction condition is mild, the product is easy to purify, the production cost is low, the average particle size of the obtained ferroferric oxide nanoparticles can be regulated and controlled by setting reactor parameters, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of iron ferric oxide nanoparticles. Background technique [0002] Magnetic Fe3O4 nanoparticles are a group of engineering and special materials with a size less than 100 nm, which can be manipulated under the action of an external magnetic field, and are not only widely used in magnetic recording media, gas sensing, dyes, but also in Medical applications and other fields, including magnetic resonance imaging (MRI), drug delivery systems, medical diagnosis, cancer treatment, microwave devices, magneto-optical devices and many other applications. The synthesis of magnetic nanoparticles with controllable size is important because the properties of these magnetic nanoparticles are strongly dependent on their size, and it is also important to characterize the size-dependent physicochemical properties of magnetic nanoparticles at low cost and with good reprod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y30/00B82Y40/00
CPCC01G49/08B82Y30/00B82Y40/00C01P2006/42C01P2002/72C01P2004/03C01P2004/64
Inventor 方杰李宏运
Owner NANTONG UNIVERSITY